关键词

嵌入式、C语言、autosar、EcuM、Rte

平台说明

项目	Value
OS	autosar OS
autosar厂商	vector
芯片厂商	TI
编程语言	C，C++
编译器	HighTec (GCC)

一、显式（Explicit）和隐式（Implicit）

创建两种不同类型的port

1.1 显式模式

1.1.1code

TASK(OsTask_10ms) /* PRQA S 3408, 1503 */ /* MD_Rte_3408, MD_MSR_Unreachable */
{

  /* call runnable */
  Runnable11(); /* PRQA S 2987 */ /* MD_Rte_2987 */

  (void)TerminateTask(); /* PRQA S 3417 */ /* MD_Rte_Os */
} /* PRQA S 6010, 6030, 6050, 6080 */ /* MD_MSR_STPTH, MD_MSR_STCYC, MD_MSR_STCAL, MD_MSR_STMIF */

读写均为操作中间变量,在runnable运行中可以被其他地方赋值改变此中间变量。

#  define Rte_Write_AsrTest_Send_Explicit_test1 Rte_Write_CpApServer_AsrTest_Send_Explicit_test1
#  define Rte_Write_CpApServer_AsrTest_Send_Explicit_test1(data) (Rte_CtApsever_AsrTest_Send_Explicit_test1 = (data), ((Std_ReturnType)RTE_E_OK))
#  define Rte_Write_AsrTest_Send_Explicit_test2 Rte_Write_CpApServer_AsrTest_Send_Explicit_test2
#  define Rte_Write_CpApServer_AsrTest_Send_Explicit_test2(data) (Rte_CtApsever_AsrTest_Send_Explicit_test2 = (data), ((Std_ReturnType)RTE_E_OK))

二、隐式模式

2.1 code

TASK(Appl_Task_10ms_OsCore3) /* PRQA S 3408, 1503 */ /* MD_Rte_3408, MD_MSR_Unreachable */
{
  EventMaskType ev;

  for(;;)
  {
    (void)WaitEvent(Rte_Ev_Cyclic2_Appl_Task_10ms_OsCore3_0_20ms | Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_10ms | Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_20ms | Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_40ms); /* PRQA S 3417 */ /* MD_Rte_Os */
    (void)GetEvent(Appl_Task_10ms_OsCore3, &ev); /* PRQA S 3417 */ /* MD_Rte_Os */
    (void)ClearEvent(ev & (Rte_Ev_Cyclic2_Appl_Task_10ms_OsCore3_0_20ms | Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_10ms | Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_20ms | Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_40ms)); /* PRQA S 3417 */ /* MD_Rte_Os */

    if ((ev & Rte_Ev_Cyclic_Appl_Task_10ms_OsCore3_0_10ms) != (EventMaskType)0)
    {
      /* START PRE RUNNABLE Appl_Runnable10ms_core0 */
      /* read implicit data */
      *(&Rte_Appl_Task_10ms_OsCore3.Rte_RB.Rte_CtAp_Demo_Core0_Appl_Runnable10ms_core0.Rte_AsrTest_recive_Implicit_test1.value) = Rte_CtApsever_AsrTest_Send_Implicit_test1; /* PRQA S 1339, 2982 */ /* MD_Rte_1339, MD_Rte_2982 */
      *(&Rte_Appl_Task_10ms_OsCore3.Rte_RB.Rte_CtAp_Demo_Core0_Appl_Runnable10ms_core0.Rte_AsrTest_recive_Implicit_test2.value) = Rte_CtApsever_AsrTest_Send_Implicit_test2; /* PRQA S 1339, 2982 */ /* MD_Rte_1339, MD_Rte_2982 */
      /* STOP PRE RUNNABLE Appl_Runnable10ms_core0 */
      /* call runnable */
      Runnabletest_server(); /* PRQA S 2987 */ /* MD_Rte_2987 */(); /* PRQA S 2987 */ /* MD_Rte_2987 */
	}
}

在调用runnabl之前就把值从地址中直接取出，在runnable当前运行完毕之前不会被重新赋值。

三、区别

1.运行效率：因为显式会比隐式多一次拷贝操作，因此在效率上显示<隐式
2.读写一致性：因为显示在runnable运行途中值会被随时改变，因此在读写一致性上显示<隐式
3.实时性：参考第二条，在实时性上显示>隐式